I'll admit they're all phenomenal musicians, but I didn't like The Human Abstract before Travis Richter joined the band. Their previous vocalist's vocals were... well, bad. They didn't do it for me. Travis, as someone said before me, made them listenable, and I'm sure that's true for a lot of people who started listening to them after Digital Veil was released.
It's sad they're calling it quits, though. I hope they go on to other bands, where their talents will be put to use.
This band deserves a bit of credit from me, as they played the very first show I ever attended. The first month after that show, pretty much all of my hangouts with friends were soundtracked by this song:
Can't say that I was a big fan of this band's albums, but they'll probably always hold a place in my heart after that show. Thanks, guys.